/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.editor.model;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

/*
 * Adapted from code by Phil Zoio at http://www.eclipse.org/articles/Article-GEF-editor/gef-schema-editor.html
 */
public abstract class PropertyAwareObject {

    public static final String CHILD = "CHILD";

    protected transient PropertyChangeSupport listeners = new PropertyChangeSupport(
            this);

    protected PropertyAwareObject() {
    }

    public void addPropertyChangeListener(PropertyChangeListener l) {
        listeners.addPropertyChangeListener(l);
    }

    public void removePropertyChangeListener(PropertyChangeListener l) {
        listeners.removePropertyChangeListener(l);
    }

    protected void firePropertyChange(String prop, Object old, Object newValue) {
        listeners.firePropertyChange(prop, old, newValue);
    }
}